Type-writer platen.



N. H. ANDERSON.

TYPE WRITER PLA'TEN. APPLICATION FILED MAY ls. I914. RENEWED DEC. 30. 1916.-

PatentdAug. 7,1917.

ATTORNEY-JV @TATE d PATENT @Qiildlfihl.

NILS iii-ll. ANDERSON, OE MIDDLETOWN, CONNECTICUT, ASSIGNOR OF ONE-HALF 'IO WILLIAM A, LORENZ, 0F HARTFORD, GONNECTICUT..

TYPE-WRI'EER PLATEN.

Specification of Letters Patent.

Application filed may 18, 1914, Serial No. 839,2 18. Renewed December 30, 1916. Serial No. 139,926.

To all whom it may concern:

Be it known that blue H. Anonnsox, citizen of the United States, and resident of liiiddletown, in the county of Middlesex and .Biate of Connecticut, has invented certain new and useful Improvements in Typewriter Pia-tens, of which the following is a specification.

My present invention relates to typewriter platens such as are employed in part to support the writing paper and against which the type of the type-bars operate when printing. I

The purpose of the invention is to provide a platen of the above class wherein the noise, caused by the operation oi? the said type against the platen will not be transmitted to the carriage in. which the platen is supported, but will thus be materially lessened.

The invention therefore belongs to that particular class of platen shown and described in my companion application #837,162 and wherein a novel form of platen is shown, though the present device is equally applicable to platens made up of wooden tubes such as are now very commonly used. As will be noted from the drawings forming a part of this specification and from the descriptions and claims to follow, the es sence of the invention consists in providing certain rubber or other suitable soft insulating materials intermediate of the connection or" the several parts and particularly between the end of the platen and its sup-porting connection with a typewriter carriage so as to cause the vibration or noise caused by the blow of the type bar to be retarded or localized,

With the above objects in view my invention further resides and consists in certain features ofconstruction and arrangements of materials and combination of parts as is clearly shown in the several'figures of the accompanying drawings and in whicl1- Figure 1 is a side elevation of my improved form of platen and having its two end, portions broken away to show central vertical sections of said parts.

Fig. is a detached outer side view of one of the two end iuclosure caps ofgthe roll.

Fig. 3 is a similar side view of one of the two end disks of the roll and intermediate of which the series of smaller disks are located.

Fig. i is a perspective viewof one of the smaller metal disks of which the. roll is formed. r

Fig. is a detached and broken side view of the end cap shown in Fig. 3 and the connee-ting rods shown in Fig. 1.

Fig. 6 shows a detachedperspective View of one of the cushioning or insulating washers shown in Fig". 1.

Fig. 7 is a perspective View of one of the several screws used for the attachment of the end disks shown in Figs. 1 and 3.

Fig: 8 shows a detached perspective View of one of the nuts used upon the ends of the rods for securing thev disks together.

Fig. 9 shows a detached vertical sectional view of a modified form of disk and l11-' sulating; means, and

Fig. 10 shows a central vertical, section of one end of a platen illustrating the application of my invention to a tubular wood form of platen roll.

As before stated I have shown my invention in Figs. 1 to 9 inclusive as applied to the particular form of platen illustrated in my prior application referred to, but as will also be seen from Fig. 10 of the drawing it can be used in connection with other forms of platens.

Referring in detail to the characters of reference marked upon the drawings 11 represents the supporting shaft which extends through the platen and which is designed to be seated and rotated in a typewriter carriage, not shown. arranged central of and extendsu freely through the intermediate portion of the platen and is secured to the .end portions thereof by means of set screws 12 passing through the hubs of the metal end caps 13 which form a part of the platen. v I

The form of platen illustrated in detail is made up of a series of metal units 14 as shown in Figs.- 1 and 4 and which are This shaft is obviously bel's thus alternate and are a series and upon the several tie rods to bridge or spoke members 0, which tie the opposite sides of the rim together. Suitable holes (Z are formed through these enlargements of the rim to accommodate tie rods 15. Felt insulating disks'lG which may be cut to conform in size and shape to the metal unitsare arrangedbetween the several disks 11. The metal and felt memform the roll or core of the platen.

The ends of the roll in this instance as in the case of the construction shown in Fig. 10 each is made up of a round metal disk or plate 17 which like thennits are insulated from the metal units by means of insulating washers. One ofthese plates is provided with a series'of countersunk holes to receive the head ends of the rods While the plate a of the other end is provided with a series of washers :22 fitted in larger holes in which a threaded nut 18 is seated and to receive the threaded ends of the said rods. These end plates together" with the series of metal units and washers form the roll as shown in Fig. 1, wlnle sinnlar plates and the wooden coreas shown in Fig. 10 form the roll in the other instance,

These rolls. as is the custom. are covered with a layer of relatively hard rubber 19 which forms the striking surface against which the type bars operate.

My invention is equally applicableto most any form of core and as will be noted in Fig. 10 can be applied to the common form of a hollow wood core 23/ This figure shows the ends of the wooden tube inclosed by the plates 17 and includes means for insulating and cushioning the same and roll from the vibration. I provideintermediate of these plates 17 and the supporting cap indicated by 13 an insulating washer '20 which may be formed of felt .or rubber. The supporting caps 13 are secured against lating washers :20 and to the end caps. by screws 21 which are placed in the outer end of the platen and pass through the rubber tapered holes of the supporting. members 13. There may obviously be 'any required number of these screws sufiicient to secure the parts together. I11 practice. however, I find that three as indicated in the drawings are ample. Owing to the enlargement of these holes the outer ends of the. washers are permitted to spread and bcttcrscrve to hold the parts together.

From the foregoing it will be noted that the body of the platen including the inner roll or core is insulated through the felt and rubber washers from. the end supporting caps 13 which latter are secured to the sup porting shaft. There is thus no direct metal strung along in engaging the connect-111g the caps to carriage in a manner to prevent" of the platen.

the said insuand'insulat-ing units arranged side b device than anything which I have yet trie Having thus described my invention what- I claim and desire to secure by Letters Patent is:

1. The combination with a typewriter platen core, of end caps for supporting the platen and having holes therethrou h, insulative bushings fitted in the hofes, means passing through the bushings and platen core for insulatively the core.

2. Ina typewriter platen, the combination with a platen roll, of end plates secured to the roll. end supporting caps for the plates. screws for securing the said caps to the ends of the plates, and rubber bushings surrounding the screws and contained in said caps whereby the platen support is insnlatively 'cushionedfrom the platen proper.

3; Ina. typewriter platen of the class described, the combination with a platen roll, of caps secured to the-ends of the roll, sepa rate cushioning pieces arranged between each of the caps and the roll. means for securing the caps to the plate-nryieldable insulative cushions secured between said caps and theirattaching means. and a supporting shaft secured solely in said caps and adapted to support the platen in a carriage.

1. A platen roll comprising a platen core. a flexible insulatingwasher secured to each end of.the platen core. caps covering the said insulating washer and forming the ends screws for attaching'the caps to the platen core. rubber washers surrounding the screws for insulating the caps from theplaten. and a supporting rod extending through the said platen core and caps.

5. Ina typewriter platen, th combination of a platen comprising a series of metal side,

a series of tie rods extending theretlirough,

'platcs engaged by the opposite ends of the rods. a flexible insulating washer arranged against the outer face of each of the said plates. a supporting cap arranged against the. said flexible washers, means for insuplaten. A platen latively securing the end caps to the plates,

and av supporting rod extending through the said end caps and-adapted to be supported in a typewriter carriage.

6. A typewriter platen having an outer cylinder with a continuous working surface, a corereinforcing said cylinder, caps at the 2 mm I ends of the core, means securing the end Signed at Chatham in the county of caps to the core, sound absorbing means in- Middlesex and State of Connecticut this terposed between the end caps and the core 14th day of May A. D., 1914. and said fastening means so as to completely NILS H. ANDERSON. sound insulate the caps from the core, and Witnesses:

a shaft extending through the core and end HUBERT C. HODGE,

' caps and supported by the end caps only. THOMAS S. BROWN 

